Physical factors include constant use of near vision, depth perception and field of vision; frequent standing, walking, sitting, reaching, manual handling, use of hearing, midrange/far vision, and typing, and occasional pushing/pulling, climbing, stooping, kneeling, crawling, use of smell, color vision and bending. Potential hazards include exposure to blood borne pathogens and sharp equipment, constant exposure to moving mechanical parts, chemicals, infectious exposure, patient contact, medical equipment; frequent computer use and occasional exposure to high exposed places.